Ergonomics

While in the UK, the term "ergonomics" refers to the whole field of "Human Factors", in the US the term refers to subset of the field dealing with human physical activity and how best to have humans doing physical work. Humans have range of motion limitations, strength limitations, environmental limitations, endurance limitations and repetitious motion limitations. Of course each individual has different constraints. Ergonomic design attempts to design equipment that can be used by as many people as possible (or a specified sub-set such as "heights ranging from the 5% female to the 95% male".